package com.ricervcvcer.order.config;

import com.alibaba.csp.sentinel.command.handler.ModifyParamFlowRulesCommandHandler;
import com.alibaba.csp.sentinel.datasource.*;
import com.alibaba.csp.sentinel.init.InitFunc;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRule;
import com.alibaba.csp.sentinel.slots.block.authority.AuthorityRuleManager;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRule;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRuleManager;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.param.ParamFlowRuleManager;
import com.alibaba.csp.sentinel.slots.system.SystemRule;
import com.alibaba.csp.sentinel.slots.system.SystemRuleManager;
import com.alibaba.csp.sentinel.transport.util.WritableDataSourceRegistry;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import org.springframework.beans.factory.annotation.Value;

import java.io.File;
import java.io.IOException;
import java.util.List;

//规则持久化
public class FilePersistence implements InitFunc {
      @Value("spring.application:name")
      private String appcationName;
      
      @Override
      public void init() throws Exception {
            String ruleDir = System.getProperty("user.home") + "/sentinel rules/"+appcationName;
            String flowRulePath = ruleDir + "/flow-rule.json";
            String degradeRulePath = ruleDir + "/degrade-rule.json";
            String systemRulePath = ruleDir + "/system-rule.json";
            String authorityRulePath = ruleDir + "/authority-rule.json";
            String paramFlowRulePath = ruleDir + "/param-flow-rule.json";
            this.mkdirIfNotExits(ruleDir);
            this.createFileIfNotExits(flowRulePath);
            this.createFileIfNotExits(degradeRulePath);
            this.createFileIfNotExits(systemRulePath);
            this.createFileIfNotExits(authorityRulePath);
            this.createFileIfNotExits(paramFlowRulePath);
            // 流控规则
            ReadableDataSource<String, List<FlowRule>> flowRuleRDS = new FileRefreshableDataSource<>(
                        flowRulePath,
                        flowRuleListParser
            );
            FlowRuleManager.register2Property(flowRuleRDS.getProperty());
            WritableDataSource<List<FlowRule>> flowRuleWDS = new FileWritableDataSource<>(
                        flowRulePath,
                        this::encodeJson
            );
            WritableDataSourceRegistry.registerFlowDataSource(flowRuleWDS);
            // 降级规则
            ReadableDataSource<String, List<DegradeRule>> degradeRuleRDS = new FileRefreshableDataSource<>(
                        degradeRulePath,
                        degradeRuleListParser
            );
            DegradeRuleManager.register2Property(degradeRuleRDS.getProperty());
            WritableDataSource<List<DegradeRule>> degradeRuleWDS = new FileWritableDataSource<>(
                        degradeRulePath,
                        this::encodeJson
            );
            WritableDataSourceRegistry.registerDegradeDataSource(degradeRuleWDS);
            // 系统规则
            ReadableDataSource<String, List<SystemRule>> systemRuleRDS = new FileRefreshableDataSource<>(
                        systemRulePath,
                        systemRuleListParser
            );
            SystemRuleManager.register2Property(systemRuleRDS.getProperty());
            WritableDataSource<List<SystemRule>> systemRuleWDS = new FileWritableDataSource<>(
                        systemRulePath,
                        this::encodeJson
            );
            WritableDataSourceRegistry.registerSystemDataSource(systemRuleWDS);
            // 授权规则
            ReadableDataSource<String, List<AuthorityRule>> authorityRuleRDS = new FileRefreshableDataSource<>(
                        authorityRulePath,
                        authorityRuleListParser
            );
            AuthorityRuleManager.register2Property(authorityRuleRDS.getProperty());
            WritableDataSource<List<AuthorityRule>> authorityRuleWDS = new FileWritableDataSource<>(
                        authorityRulePath,
                        this::encodeJson
            );
          
            WritableDataSourceRegistry.registerAuthorityDataSource(authorityRuleWDS);
            // 热点参数规则
            ReadableDataSource<String, List<ParamFlowRule>> paramFlowRuleRDS = new FileRefreshableDataSource<>(
                        paramFlowRulePath,
                        paramFlowRuleListParser
            );
            ParamFlowRuleManager.register2Property(paramFlowRuleRDS.getProperty());
            WritableDataSource<List<ParamFlowRule>> paramFlowRuleWDS = new FileWritableDataSource<>(
                        paramFlowRulePath,
                        this::encodeJson
            );
            ModifyParamFlowRulesCommandHandler.setWritableDataSource(paramFlowRuleWDS);
     }

     private Converter<String, List<FlowRule>> flowRuleListParser = source -> JSON.parseObject(
                  source,
                  new TypeReference<List<FlowRule>>() {}
     );

     private Converter<String, List<DegradeRule>> degradeRuleListParser = source -> JSON.parseObject(
                  source,
                  new TypeReference<List<DegradeRule>>() {}
     );
     private Converter<String, List<SystemRule>> systemRuleListParser = source -> JSON.parseObject(
                  source,
                  new TypeReference<List<SystemRule>>() {}
     );
     private Converter<String, List<AuthorityRule>> authorityRuleListParser = source -> JSON.parseObject(
                  source,
                  new TypeReference<List<AuthorityRule>>() {}
     );
     private Converter<String, List<ParamFlowRule>> paramFlowRuleListParser = source -> JSON.parseObject(
                  source,
                  new TypeReference<List<ParamFlowRule>>() {}
     );
     private void mkdirIfNotExits(String filePath) throws IOException {
            File file = new File(filePath);
            if (!file.exists()) {
             file.mkdirs();
            }
     }
     private void createFileIfNotExits(String filePath) throws IOException {
            File file = new File(filePath);
            if (!file.exists()) {
             file.createNewFile();
            }
     }
     private <T> String encodeJson(T t) {
            return JSON.toJSONString(t);
     }
}
